Kirthua (Kirthuā) is a village in Karhal block of Mainpuri district, Uttar Pradesh, India. As of 2011, it has a population of 4,858, in 883 households.

As of 2011, Kirthua had a population of 4,858, in 883 households. This population was 54.1% male (2,630) and 45.9% female (2,228). The 0-6 age group numbered 723 (373 male and 350 female), or 14.9% of the total population. 1,305 residents were members of Scheduled Castes, or 26.9% of the total.

The 1961 census recorded Kirthua as comprising 3 hamlets, with a total population of 2,280 people (1,133 male and 1,147 female), in 388 households and 294 physical houses. The area of the village was given as 2,322 acres.

As of 2011, Kirthua had 3 primary schools; it did not have any healthcare facilities. Drinking water was provided by hand pump and tube well; there were no public toilets. The village had a post office but no public library; there was at least some access to electricity for all purposes. Streets were made of both kachcha and pakka materials.